Makinga crystal set (circa 1984)

This started as a basic crystal set, as you can guess
from the earpiece used. However, when you're an 11 year
electronics geek (and have a father that's one too) you
quickly start improving it. Our 'improvement' was to
build an amplifier circuit.

It's a basic transistor circuit, available from most books,
but built on a tag strip to use the least amount of space.